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23126 Physiology

An elderly hypothyroid patient with chronic gastrointestinal complaints is being treated with triiodothyronine (T3) rather than thyroxine replacement because the former drug has better gastrointestinal absorption. When compared with no medication, triiodothyronine should have which of the following effects on serum levels of TSH, T3, and T4?

ADecreased TSH, decreased T3, and decreased T4
BDecreased TSH, increased T3, and decreased T4
CDecreased TSH, increased T3, and increased T4
DIncreased TSH, decreased T3, and decreased T4
Physiology
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